as mark sayre tells us, the fbi is taking it serious. >> reporter: they are in charge of the investigation and alameda county sheriff's deputies say there is no question that what they found is potentially very dangerous. the incident occurred here at the terminal 2 security checkpoint at the oakland international airport. authorities say 49-year-old jeffrey mcgann a 49-year-old resident of rancho palos verdes was trying to board a home to l.a.x. when attempted to pass through the security checkpoint with a suspicious watch. >> the watch had on it a toggle switch, a series of fuses, series of wires protruding from it, a circuit board, and the watch itself, which was on incorrect time. >> reporter: it wasn't just the watch that drew the attention of authorities. it was also mcgann's overall behavior and an unusual alteration to his boots. >> they also had what appeared to be a homemade cavity in there. and he was very evasive on everything that he was doing. >> reporter: while no actual explosives were found on mcgann, nor in his luggage, authorities say there's no question he was carrying